Yumrotun S. PENGARUH MODEL PROBLEM BASED LEARNING TERHADAP KEAKTIFAN DAN HASIL BELAJAR MATEMATIKA MATERI PECAHAN SISWA KELAS IV SD NEGERI 01 SIDOMULYO KENDAL. JGK [Internet]. 2019 Aug. 5 [cited 2025 Jan. 7];2(4):49-56. Available from: http://103.242.233.34/index.php/jgkp/article/view/13575